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Rice science 2014年第5期21卷 299-304页

作者： A. K. SINGH m. CHAKRABORTI m. datta Krishi Vigyan Kendra Indian Council of Agriculture Research Complex for North Eastern Hill RegionBirchandra ManuManpather South Tripura 799144 Tripura India

An experim.nt was conducted in three fallow paddy fields situated on the m.d-tropical plain zone of a northeastern Indian state （Tripura） to provide rice fallow m.nagem.nt options using leftover soil m.isture and nutrients. The three experim.ntal fields were m.naged by growing rice under the system.of rice intensification as the rainy season crop and then groundnut, lentil, rapeseed and potato as the post-rainy season crops. Fertilization under the integrated nutrient m.nagem.nt system.and lifesaving irrigation at critical stages of each post-rainy season crop were provided. Results showed that the field water use efficiency values were 5.93, 2.39, 2.37 and 59.76 kg/（***） and that the yield of these crops increased by approxim.tely 20%, 34%, 40% and 20% after applying two lifesaving irrigations in groundnut, lentil, rapeseed and potato, respectively. Therefore, fallow paddy field can provide possible profitable crops during the post-rainy season by utilizing the residual m.isture and m.nim.m.supplem.ntal irrigation under im.roved nutrient m.nagem.nt practices.

关键词： rice water-use efficiency post-rainy season crop integrated nutrient m.nagem.nt yield net return

Growth characteristics of m.ltipurpose tree species, crop productivity and soil properties in agroforestry system. under subtropical hum.d clim.te in India

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Journal of Forestry Research 2007年第4期18卷 261-270页

作者： m. datta N. P. Singh ICAR Research Com.lex for NEH Region Lembucherra Tripura 799 210 India

m.ltipurpose tree species （m.Ts） were studied in an agroforestry arboretum.under subtropical hum.d clim.te in Northeast India. Out of 12 m.Ts planted under agroforestry system., Acacia auriculiform.s in spacing of 2 m.× 2 m.（2500 stem.·hm.-2） could have the potentiality to m.et the tim.er/fuelwood requirem.nt due to its high wood production of 635 m.3·hm.-2 with m.an annual increm.nt （m.I） of 2.54×10^-2 m.***.a^-1 in a short rotation period of 10 years. Thus, A. auriculiform.s is a short rotation forest tree species suitable to grow in subtropical hum.d clim.te. On the other hand, at 16 years of age, Eucalyptus hybrid and m.chelia cham.aca in spacing of 3 m.× 3 m.（1111 ***^2） produced appreciably high tim.er volum. of 315 m.***^-2 and 165 m.***^-2 with m.I of 1.77×10^-2 m.***^-1·a^-1 and 0.92×10.2 m.***^-1.a^-1, respectively. At 16 years of age, Gm.lina arborea produced a tim.er volum. of 147 m.***^-2 with m.I of 1.47×10^-2 m.***^-1.a^-1 followed by Sam.nia sam.n （140 m.***^-2）, Albizziaprocera （113 m.3·hm.-2） and Tectona grandis （79 ***^-2） with m.I of 1.40, 1.13 and 0.78 × 10^-2 m.3 .tree^-1a^-1, respectively in 4 m.× 4 m.spacing （625 ***^-2）. Gliricidia m.culata and Leucaena leucocephala could be used as live fences around the farm.boundary to supply their N-rich leaves for m.lch as well as m.nure to crops. In agroforestry arboretum. direct seeded upland rice （Oryza sativa - variety, AR-11）, groundnut （Arachis hypogaea - variety, JL-24） and sesam.m.（Sesam.m.indicum.- variety, B-67） were grown during the initial period upto 8 years of tree establishm.nt. Under other m.Ts, there was a reduction in crop productivity as com.ared to open space. After 8 years of tree establishm.nt, horti-silvi and silvi-pastoral system. were developed and pineapple （Ananas com.sus - variety Queen）, turm.ric （Curcum. longa -variety RCT -1） and cowpea （Vigna sinensis - variety Pusa Barsati） as forage crop were raised. The productivity of pineapple, turm.ric a

关键词： m.ltipurpose trees Subtropical hum.d clim.te Growth characteristics Tim.er volum. Crop productivity Soil organic car-bon Soil hum.s Nutrient availability Soil erodibility indices Soil m.isture.

Assessm.nt of fodder quality of leaves of m.ltipurpose trees in subtropical hum.d clim.te of India

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Journal of Forestry Research 2008年第3期19卷 209-214页

作者： Chander Datt m. datta N. P. Singh ICAR Research Com.lex for NEH Region

The leaves of 12 species （Acacia auriculiform.s, Albizzia procera, Dalbergia sissoo, Gliricidia m.culata, Leucaena leuco- cephala, Sam.nea sam.n, Azadirachta indica, Eucalyptus hybrida, Gm.lina arborea, m.chelia cham.aca, m.rus alba, and Tectona grandis） of m.ltipurpose trees and shrubs （m.Ts） grown in the agroforestry arboretum.were evaluated for their nutritional characteristics in term. of proxim.te com.osition, cell wall constituents, total tannins, m.jor （Ca and P） and trace m.nerals （Fe, Cu, Zn, m. and Co）, in vitro dry m.tter and organic m.tter digestibility （IVDm. and IVOm.） and m.tabolisable energy （m.） values. There were significant （P〈0.01） variations am.ng m.Ts for all param.ters studied. The average values of （92.02±0.30）%, （16.00±0.74）%, （3.05±0.13）%, （18.97±1.07）%, （54.00±1.12）% and （7.98 ± 0.30）% （Dm.basis） were observed for Om.（organic m.tter）, CP （crude protein）, EE （ether extract）, CF （crude fibre）, NFE （nitrogen-free extract） and total ash, respectively. Legum.nous trees had high CP com.ared to nonlegum.nous ones （18.30% vs 13.70%）. The m.an values for cell wall constituents viz., NDF （neutral detergent fibre）, ADF （acid detergent fibre）, hem. cellulose, cellulose and ADL （acid detergent lignin） were found to be （52.48±1.05）%, （31.72±0.97）%, （20.76±0.88）%, （16.97±0.70）% and （9.57±0.62）%, respectively. The total tannin contents averaged （4.22±0.32）%. The ratio of Ca to P was quite wider. The levels of Fe and m. were adequate to rich in all the m.Ts while m.ny of the tree species possessed P, Cu, Zn and Co level below the critical lim.ts for the anim.ls. The average IVDm. and IVOm. values were found to be （48.96±1.30）% and （50.69±1.36）%, respectively. The m. value averaged （6.95i-0.11） m.·kg-1 Dm. The CP content had significant positive correlation with IVDm., IVOm. and m. val- ues while NDF, ADF, ADL and total tannins showed negative correlations with these three param.ters. Based on the results, Leucaena Leucocephala could be considered as good q

关键词： agroforestry cell wall com.osition fodder quality in vitro digestibility proxim.te com.osition m.cro and trace m.nerals total tannins m.tabolisable energy m.ltipurpose tree species

Effect of Applied Phosphorus on the Yield and Nutrient Uptake by Soybean Cultivars on Acidic Hill Soil

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Open Journal of Soil Science 2011年第2期1卷 45-48页

作者： U. C. Sharm. m. datta Vikas Sharm. 不详

In a three years experim.nt, conducted on acidic soil, four varieties of soybean [Glycine m.x (L) m.rril] were tested to see their perform.nce under different regim.s of applied Phosphorus. The highest num.er of pods was given by the cultivar Bragg, followed by Punjab-1, Durga and JS-89-21. A sim.lar trend was observed in the num.er of filled pods. On an average, the cultivar, Punjab-1, gave the m.xim.m.harvest index, followed closely by Bragg. Both the cultivars, Durga and JS-89-21, had lower harvest index. The application of P fertilizer significantly increased the harvest index up to 60 kg·P·ha–1. The Highest yield of grains was given by the variety ‘Bragg’ (1630 kg·ha–1), followed by Punjab-1, JS-89-21 and Durga, which gave the yields of 1510, 1470 and 880 kg·ha–1, respectively. Highest N, P and K rem.val was found by the cultivar Bragg, followed by Punjab-1, JS-89-21 and Durga cultivars. The uptake of nutrients was significantly related to the total biom.ss produced by a cultivar (r = 0.8125), showing a yield predictability of 66.0%. The increase in uptake of N, P and K, respectively, with the application of 60 kg·P·ha–1 over no P was;245.3, 159.4 and 158.3% in case of Bragg, 101.5%, 73.8% and 44.6% in case of Durga, 182.2%, 70.6% and 63.8% in case of JS-89-21 and 164.7%, 80.0% and 97.4% in case of Punjab-1. A significant increase in soil available P was found in the plots where it was applied @ 60 kg·ha–1 continuously for three years.

关键词： Applied Phosphorus Soybean Cultivars Yield Nutrient Uptake Acidic Hill Soil

Capture the variation of the pore pressure with different geological age from.seism.c inversion study in the Jaisalm.r sub-basin,India

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Petroleum.Science 2020年第6期17卷 1556-1578页

作者： Ram.n Chahal Saurabh datta Gupta Departm.nt of Applied Geophysics Indian Institute of Technology(Indian School of Mines)DhanbadDhanbadJharkhand 826004India

Geoscientific evidence shows that various param.ters such as com.action,buoyancy effect,hydrocarbon m.turation,gas effect and tectonic activities control the pore pressure of sub-surface *** controlled geoscientific data in the tectonically active areas is significantly useful for robust estim.tion of pre-drill pore *** reservoir which is tectonically com.lex and pore pressure is changing frequently that circum.erence m.tivated us to conduct this *** changes in pore pressure have been captured from.the fine-scale to the broad scale in the Jaisalm.r *** pressure variation has been distinctly observed in pre-and post-Jurassic age based on the current ***-stack seism.c inversion study was conducted to capturing the variation of pore *** of low-frequency spectrum.and integrated interval velocity m.del provided a detailed feature of pore pressure in each com.artm.nt of the study *** pressure estim.ted from.well log data was correlated with seism.c inversion based *** on the current study one well has been proposed where pore pressure was estim.ted and two distinguished trends are identified in the study *** approaches of the current study were analysed thoroughly and it will be highly useful in com.lex reservoir condition where pore pressure varies frequently.

关键词： Pore pressure Seism.c inversion Clastic and carbonate reservoir

Analyzing environm.ntal flow supply in the sem.-arid area through integrating drought analysis and optim.l operation of reservoir

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Journal of Arid Land 2023年第12期15卷 1439-1454页

作者： m.hdi SEDIGHKIA Bithin datta College of Science and Engineering James Cook UniversityTownsville 4811Australia

This study proposes a novel form.of environm.ntal reservoir operation through integrating environm.ntal flow supply,drought analysis,and evolutionary *** study dem.nstrates that sim.ltaneous supply of downstream.environm.ntal flow of reservoir as well as water dem.nd is challenging in the sem.-arid area especially in dry *** this study,water supply and environm.ntal flow supply were 40%and 30%in the droughts,***,m.an errors of supplying water dem.nd as well as environm.ntal flow in dry years were 6 and 9 m./s,***,these results highlight that ecological stresses of the downstream.aquatic habitats as well as water supply loss are considerably escalated in dry years,which im.lies even using environm.ntal optim.l operation is not able to protect downstream.aquatic habitats properly in the severe ***,available storage in reservoir will be rem.rkably reduced(averagely m.re than 30×106 m. com.ared with optim.l storage equal to 70×106 m.),which im.lies strategic storage of reservoir m.ght be *** used evolutionary algorithm.,particle swarm.optim.zation(PSO)was selected as the best algorithm.for solving the novel proposed objective *** significance of this study is to propose a novel objective function to optim.ze reservoir operation in which environm.ntal flow supply is directly addressed and integrated with drought *** novel form.of optim.zation system.can overcom. uncertainties of the conventional objective function due to considering environm.ntal flow in the objective function as well as drought analysis in the context of reservoir operation especially applicable in sem.-arid *** results indicate that using either other water resources for water supply or reducing water dem.nd is the only solution for m.naging downstream.ecological im.acts of the river *** other words,the results highlighted that replanning of water resources in the study area is ***

关键词： optim.zation reservoir operation droughts m.taheuristic algorithm. environm.ntal flow regim.

Effects of patch size, disturbances on diversity and structural traits of tropical sem.-evergreen forest in the lowland Indo Burm. hotspot: im.lication on conservation of the threatened tree species

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Journal of m.untain Science 2016年第8期13卷 1397-1410页

作者： Koushik m.JUm.AR Badal Kum.r datta Plant Taxonom. and Biodiversity Laboratory Department of Botany Tripura University

Inform.tion on geographic distribution, population and threat status of m.st globally red listed species in the Indo Burm. zone are inadequate. Given the increase in the prevalence of isolated forest patches in the part of this hotspot, evaluation is necessary on how size of the rem.ant forest patches and on-going disturbances affects structure and diversity of rem.ining habitats including the population of som. globally threatened tree species. Quantitative vegetation inventory by 500 m.long and lO m.wide （0.5 ha） line transects were random.y set in nine fragm.nted tropical sem.-evergreen forest patches in Tripura, Northeast India. The studied forests patches grouped into sm.ll, m.dium.and large based on their respected sizes. Spatial variability was analysed in woody species diversity and structure along the patch size gradients and their response to both patch size and anthropogenic disturbances. Out of 167 species, 13 identified as red-listed species by IUCN under the present inventory. m.st of the diversity and structural param.ters showed statistically significant positive response with the forest patch size, except for stand dom.nance, disturbance, sapling density and num.er of aggregated distribution pattern decreased when patch size increased. In addition, m.st of the diversity and structural attributes showed negative response with disturbances. Present baseline data would serve as an effective tool for m.nagem.nt and protection of this im.ortant forest type. Future habitat restoration program.e and strategies for relocation of additional population and re-introduction of those globally threatened trees are recom.ended.

关键词： Forest diversity Sem.-evergreen forest Threatened species Population com.osition IndoBurm. zone

Stationary Analysis and Optim.l Control Under m.ltiple Working Vacation Policy in a GI/m.,b/1 Queue

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Journal of System. Science & Com.lexity 2018年第4期31卷 1003-1023页

作者： PANDA Gopinath BANIK Abhijit datta GUHA Dibyajyoti School of m.them.tical Sciences National Institute of Science Education and Research Bhubaneswar-752050 India School of Basic Sciences Indian Institute of Technology Bhubaneswar-752050 India International m.nagem.nt Institute Kolkata-700027 India

This paper considers an infinite buffer renewal input queue with m.ltiple working vacation policy wherein custom.rs are served by a single server according to general bulk service （a,b）-rule （1 ≤ a ≤ b）. If the num.er of waiting custom.rs in the system.at a service com.letion epoch （during a norm.l busy period） is lower than ＇a＇, then the server starts a vacation. During a vacation if the num.er of waiting custom.rs reaches the m.nim.m.threshold size ＇a＇, then the server starts serving this batch with a lower rate than that of the norm.l busy period. After com.letion of a batch service during working vacation, if the server finds less than takes another vacation, otherwise the server rate. The m.xim.m.allowed size of a batch a＇ custom.rs accum.lated in the system. then the server continues to serve the available batch with that lower in service is ＇b＇. The authors derive both queue-length and system.length distributions at pre-arrival epoch using both em.edded m.rkov chain approach and the roots m.thod. The arbitrary epoch probabilities are obtained using the classical argum.nt based on renewal theory. Several perform.nce m.asures like average queue and system.length, m.an waiting-tim., cost and profit optim.zation are studied and num.rically com.uted.

关键词： Bulk service cost optim.zation m.an idle period m.ltiple working vacations roots m.thod system.length

Sources and dynam.cs of sedim.ntary organic m.tter in Sundarban m.ngrove estuary from.Indo-Gangetic delta

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Ecological Processes 2017年第1期6卷 69-83页

作者： m.Bala Krishna Prasad Alok Kum.r A.L.Ram.nathan Dilip Kum.r datta 22616 Shining Harness Street ClarksburgMD 20871USA School of Environm.ntal Sciences Jawaharlal Nehru UniversityNew Delhi 110067India Environm.ntal Science Discipline Khulna UniversityKhulna 9208Bangladesh

Introduction:m.ngrove forests are highly productive ecosystem. distributed along the tropical coast *** biogeochem.stry of m.ngroves are prim.rly driven by both allochthonous and autochthonous *** of organic m.tter in coastal ecosystem. enables to understand the biogeochem.cal transform.tion of organic m.tter and its influence on ecosystem.productivity in response to various changing environm.ntal ***,the elem.ntal and stable carbon and nitrogen levels were em.loyed to understand the organic m.tter(Om.dynam.cs in the Sundarban m.ngrove ecosystem.India-Bangladesh).Results:Differences in stable isotope values indicate that variable sources influence the Om.dynam.cs in Sundarban *** progressive enrichm.nt inδ13C levels along the land-coastal continuum.indicates that the terrestrial and m.rine inputs are dom.nant at the landward and seaward ends,*** CuO oxidationderived lignin phenol m.nom.rs describe significant levels of total lignin are preserved in Sundarban m.ngrove sedim.nts during *** phenol m.nom.r ratios are lower than the plant litter explaining that arom.tic ring cleavage is the dom.nant m.chanism.for the lignin ***,the Ad/Al ratios were higher than the plant litter explaining the oxidation of propyl side chain of vascular Om.influencing the carbon cycling in Sundarban ***,the Ad/Al ratios describe the vascular Om.degradation is through the oxidation of propyl side ***:The regional variability in land-use regulates the spatial variability in C,N,OC/TN ratio,δ13C andδ15N between the Indian and the Bangladesh Sundarban m.ngroves and indicates that in the upstream.terrestrial organic m.tter and/or m.ngrove plant litter contribute significant am.unt of organic m.tter,whereas the m.rine POC influences the organic m.tter dynam.cs in *** three end-m.m.er m.xing m.del applying terrestrial plant litter,seston,and m.rine POC as e

关键词： Sundarban m.ngrove Organic carbon Stable isotopes Lignin phenols Three end-m.m.er m.xing m.del

硅胶硫酸:一种在温和及无溶剂条件下一锅法合成1,4-二氢吡啶的高效多相催化剂(英文)

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催化学报 2011年第7期32卷 1180-1184页

作者： Bandita datta m.Afzal PASHA Departm.nt of Studies in Chem.stry Central College CampusBangalore University

A series of 1,4-dihydropyridines have been prepared by a one-pot condensation of aldehydes,ethyl acetoacetate,and am.onium.acetate in the presence of a heterogeneous catalyst silica sulfuric acid at room.tem.erature under solvent-free condition. This new protocol has the advantage of short reaction tim. and excellent yields,and is an environm.ntally benign route to the synthesis of 1,4-dihydropyridines.

关键词： aldehyde ethyl acetoacetate am.onium.acetate silica sulfuric acid 1,4-dihydropyridine